package handlers

import (
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"

	"code.springupsoftware.com/cmc/cmc-sales/internal/cmc/db"
	"github.com/gorilla/mux"
)

type CustomerHandler struct {
	queries *db.Queries
}

func NewCustomerHandler(queries *db.Queries) *CustomerHandler {
	return &CustomerHandler{queries: queries}
}

func (h *CustomerHandler) List(w http.ResponseWriter, r *http.Request) {
	limit := 50
	offset := 0

	if l := r.URL.Query().Get("limit"); l != "" {
		if val, err := strconv.Atoi(l); err == nil {
			limit = val
		}
	}

	if o := r.URL.Query().Get("offset"); o != "" {
		if val, err := strconv.Atoi(o); err == nil {
			offset = val
		}
	}

	customers, err := h.queries.ListCustomers(r.Context(), db.ListCustomersParams{
		Limit:  int32(limit),
		Offset: int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(customers)
}

func (h *CustomerHandler) Get(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid customer ID", http.StatusBadRequest)
		return
	}

	customer, err := h.queries.GetCustomer(r.Context(), int32(id))
	if err != nil {
		if err == sql.ErrNoRows {
			http.Error(w, "Customer not found", http.StatusNotFound)
			return
		}
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(customer)
}

func (h *CustomerHandler) Create(w http.ResponseWriter, r *http.Request) {
	// Parse form data for HTMX requests
	if err := r.ParseForm(); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	params := db.CreateCustomerParams{
		Name:                    r.FormValue("name"),
		TradingName:            r.FormValue("trading_name"),
		Abn:                    sql.NullString{String: r.FormValue("abn"), Valid: r.FormValue("abn") != ""},
		Notes:                  r.FormValue("notes"),
		DiscountPricingPolicies: r.FormValue("discount_pricing_policies"),
		PaymentTerms:           r.FormValue("payment_terms"),
		CustomerCategoryID:     1, // Default category
		Url:                    r.FormValue("url"),
		CountryID:              1, // Default country
	}

	// Check if this is a JSON request
	if r.Header.Get("Content-Type") == "application/json" {
		if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
	}

	result, err := h.queries.CreateCustomer(r.Context(), params)
	if err != nil {
		if r.Header.Get("HX-Request") == "true" {
			w.Header().Set("Content-Type", "text/html")
			w.Write([]byte(`<div class="notification is-danger">Error creating customer</div>`))
			return
		}
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	id, err := result.LastInsertId()
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	// If HTMX request, redirect to customer page
	if r.Header.Get("HX-Request") == "true" {
		w.Header().Set("HX-Redirect", "/customers/"+strconv.FormatInt(id, 10))
		w.WriteHeader(http.StatusCreated)
		return
	}

	// JSON response for API
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]interface{}{
		"id": id,
	})
}

func (h *CustomerHandler) Update(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid customer ID", http.StatusBadRequest)
		return
	}

	var params db.UpdateCustomerParams
	if err := json.NewDecoder(r.Body).Decode(&params); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	params.ID = int32(id)

	if err := h.queries.UpdateCustomer(r.Context(), params); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *CustomerHandler) Delete(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	id, err := strconv.Atoi(vars["id"])
	if err != nil {
		http.Error(w, "Invalid customer ID", http.StatusBadRequest)
		return
	}

	if err := h.queries.DeleteCustomer(r.Context(), int32(id)); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

func (h *CustomerHandler) Search(w http.ResponseWriter, r *http.Request) {
	query := r.URL.Query().Get("q")
	if query == "" {
		http.Error(w, "Search query required", http.StatusBadRequest)
		return
	}

	limit := 50
	offset := 0

	if l := r.URL.Query().Get("limit"); l != "" {
		if val, err := strconv.Atoi(l); err == nil {
			limit = val
		}
	}

	if o := r.URL.Query().Get("offset"); o != "" {
		if val, err := strconv.Atoi(o); err == nil {
			offset = val
		}
	}

	customers, err := h.queries.SearchCustomersByName(r.Context(), db.SearchCustomersByNameParams{
		CONCAT:   query,
		CONCAT_2: query,
		Limit:    int32(limit),
		Offset:   int32(offset),
	})
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(customers)
}